The thing with phones and laptops, though, is that you can change their settings (disable Siri/Cortana/Bixby etc) and refuse permission for apps to use your microphone and camera. If you were to do that with Alexa, there'd be no point in having it at all. I really don't see what it achieves for most able-bodied people as opposed to just pressing a few keys on your phone or computer.
Allowing one of these into your home is potentially opening the floodgates and, as PP have said, making a culture of constant surveillance (aka Big Brother) normal. Our children and their children won't know any different.
If you've nothing to hide then you have nothing to worry about, eh? Your life is too boring for anybody to be interested in?
Have you ever murdered or violently attacked somebody and then spoken about it with others in your own home? Almost certainly not.
Have you ever laughed off having to floor the accelerator to get to an important meeting in time? Have you (half-jokingly) commented about what you'd like to see happen to Donald Trump or Piers Morgan? Have you even just said "I'm going to kill her" as a turn of phrase about somebody who's annoyed you? Has your teenager ever screamed at you that they hate you and that you're abusive because you won't let them stay out after midnight on a school night?
Have you ever expressed gender critical opinions? Potentially 'hate speech', then? Any other opinions which are unPC/unwoke/unfashionable etc.?
Just remember that crime legislation is changing all of the time. It's easy to laugh at ancient laws about being allowed to shoot a Welshman in Chester with a bow and arrow or mince pies being banned, but there are lots of things that didn't used to be illegal and now are - or which are officially 'frowned on' and actual legislation on it might only be a matter of time. Some law changes are very good and progressive; others are little more than a creep towards oppression.
I most definitely would never have an Alexa or similar on my home - at least whilst it's optional. Would they ever make it compulsory to have one? Who knows? You can never be too careful, can you? It's there to protect the whole of society. After all, only those with something to hide have anything to fear.... right....